15.3 Simple Special Forms

or, and, if, cond, progn, prog1, prog2, setq, quote, function, let*, let, while

All of these are very simple and work as expected, calling Feval() or Fprogn() as necessary and (in the case of let and let*) using specbind() to create bindings and unbind_to() to undo the bindings when finished.

Note that, with the exception of Fprogn, these functions are typically called in real life only in interpreted code, since the byte compiler knows how to convert calls to these functions directly into byte code.